Daikin VRV-WIII RWEYQ72PTJU Service Manual page 259

SiUS30-1301
CHECK 12
Pressure Sensor
CHECK 13
Measurement of Voltage of the High Pressure Sensor.
CHECK 14
Measurement of Voltage of the Low Pressure Sensor.
Service Diagnosis
Detected Pressure
psi
725
652
580
507
435
362
290
217
145
72
0
-72
Micro-controller
A/D input
Make measurement of DC voltage between these wires.
Micro-controller
A/D input
Make measurement of DC voltage between these wires.
Troubleshooting by Indication on the Remote Controller
P = 1.38V -0.69 V : Output Voltage [High Side] V
H H H
P = 0.57V -0.28 V : Output Voltage [Low Side] V
L L L
P : High pressure
H
P : Low pressure
L
Output Voltage (V V )
H, L
Connector for high pressure sensor
+5V
∗3
(4)
(3)
(2)
(1)
+5V
Connector for low pressure sensor
∗3
(4)
(3)
(2)
(1)
DC
DC
High Pressure (P )
H
Low Pressure (P )
L
Red
High
Black
pressure
sensor
White
Red
Black
Low
pressure
White sensor
251